2461319- After upgrade , query fails in dflib/dfo.cxx:13950 in order by node -- SAP IQ

Symptom

Working query in IQ 15.x with group by clause fails after upgrade to IQ 16 sp11 with error. ---- at dflib/dfo.cxx:13950 on thread 140208361068288 (TID 14) Internal error at node: #03 Can not evaluate expression: SUM(SUM(a.rx_written_qtr_1))`(1) Error detected at DFO #03 Order By----